Fixing SConsValues to work with py2/3. Turns out because in py2 optparse.Values is a classic class deepcopy works different than in py3 when it's a modern class (no more classic classes). The net of which is deepcopy will look for various methods to copy the objects state, __deepcopy__, something else, then __setstate__. When it checks for __setstate__ it trys on a blank SConsValue instance which doesn't have __defaults__ and so SConsValues ends up throwing a KeyError exception. deepcopy is looking for an AttributeError exception to know that __setstate__ is not available. Once it receives the appropriate exception, it then properly copies the object and scons interactive mode works with py3

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